# Top Down Triangle Printing In C

A triangle with one of its angle 90° is called right triangle. We shall now see how to print stars *, in right triangle shape, but upside down on y axis.

## Algorithm

Algorithm should look like this −

```Step 1 - Take number of rows to be printed, n.
Step 2 - Make outer iteration I for n times to print rows
Step 3 - Make inner iteration for J to I
Step 3 - Print "*" (star)
Step 4 - Print NEWLINE character after each inner iteration
Step 5 - Return
```

## Pseudocode

We can derive a pseudocode for the above mentioned algorithm, as follows −

```procedure topdown_triangle

FOR I = 1 to N DO
FOR J = 1 to I DO
PRINT "*"
END FOR
PRINT NEWLINE
END FOR

end procedure
```

## Implementation

Implementation of right triangle in C is as follows −

```#include <stdio.h>

int main() {
int n,i,j;

n = 5;

for(i = 0; i < n; i++) {
for(j = 0; j<i; j++)
printf("  ");

for(j = i; j < n; j++)
printf(" *");

printf("\n");

}

return 0;
}
```

The output should look like this −

``` * * * * *
* * * *
* * *
* *
*
```
patterns_examples_in_c.htm
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